Intraneural ganglion cyst
Right sided neural pain around the knee following a football injury months previously. Symptoms worsening despite rest. No fracture.
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Features here are of an intraneural ganglion cyst.
A capsular tear at the proximal tibiofibular joint results in fluid tracking in the epineural sheath of the articular branch and then along the path of least resistance, the tibial nerve. The fluid may track all the way up to the sciatic bifurcation and even descend retrograde along the femoral nerve.